Praising the pace of the work by the Sukhoi aircraft manufacturer on the production of the new state-of-the-art, single-seat fighter, Krivoruchko added that engineers are finishing tests on the second-stage engines of the Su-57. The jet was known as the PAK FA and T-50 during development.

The Su-57, whose avionics system allows autonomous battlefield calculations to assist the pilot, is expected to eventually replace the iconic, but aging, Su-27 multipurpose fighters. After making its maiden flight in 2010, and after years of research and development, Russia's fifth-generation stealth fighters could come into service in 2019, CEO of Russia's United Aircraft Corporation Yuri Slyusar stated on Friday.